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File: callbacks.html
<!doctype html>
<html>

<head>
	<title>Tooltip Hooks</title>
	<script src="../../Chart.bundle.js"></script>
	<script src="../utils.js"></script>
	<style>
	canvas {
		-moz-user-select: none;
		-webkit-user-select: none;
		-ms-user-select: none;
	}
	</style>
</head>

<body>
	<div style="width:75%;">
		<canvas id="canvas"></canvas>
	</div>
	<script>
		var config = {
			type: 'line',
			data: {
				labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
				datasets: [{
					label: 'My First dataset',
					borderColor: window.chartColors.red,
					backgroundColor: window.chartColors.red,
					data: [
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor()
					],
					fill: false,
				}, {
					label: 'My Second dataset',
					borderColor: window.chartColors.blue,
					backgroundColor: window.chartColors.blue,
					data: [
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor(),
						randomScalingFactor()
					],
					fill: false,
				}]
			},
			options: {
				responsive: true,
				title: {
					display: true,
					text: 'Chart.js Line Chart - Custom Information in Tooltip'
				},
				tooltips: {
					mode: 'index',
					callbacks: {
						// Use the footer callback to display the sum of the items showing in the tooltip
						footer: function(tooltipItems, data) {
							var sum = 0;

							tooltipItems.forEach(function(tooltipItem) {
								sum += data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
							});
							return 'Sum: ' + sum;
						},
					},
					footerFontStyle: 'normal'
				},
				hover: {
					mode: 'index',
					intersect: true
				},
				scales: {
					xAxes: [{
						display: true,
						scaleLabel: {
							show: true,
							labelString: 'Month'
						}
					}],
					yAxes: [{
						display: true,
						scaleLabel: {
							show: true,
							labelString: 'Value'
						}
					}]
				}
			}
		};

		window.onload = function() {
			var ctx = document.getElementById('canvas').getContext('2d');
			window.myLine = new Chart(ctx, config);
		};
	</script>
</body>

</html>